218939378145 has 8 divisors (see below), whose sum is σ = 350303005056. Its totient is φ = 116767668336.

The previous prime is 218939378117. The next prime is 218939378233. The reversal of 218939378145 is 541873939812.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 218939378145 - 2⁶ = 218939378081 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7297979257 + ... + 7297979286.

It is an arithmetic number, because the mean of its divisors is an integer number (43787875632).

Almost surely, 2^218939378145 is an apocalyptic number.

It is an amenable number.

218939378145 is a deficient number, since it is larger than the sum of its proper divisors (131363626911).

218939378145 is a wasteful number, since it uses less digits than its factorization.

218939378145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14595958551.

The product of its digits is 13063680, while the sum is 60.

The spelling of 218939378145 in words is "two hundred eighteen billion, nine hundred thirty-nine million, three hundred seventy-eight thousand, one hundred forty-five".